The main change would probably be, in order for Antarctica to become green, all the ice would have to come off it. How would that happen, and where would it go?

The main change would probably be, in order for Antarctica to become green, all the ice would have to come off it. How would that happen, and where would it go? It would have to melt, and run into the ocean as water. What that will mean for the liveable regions of Earth is that as the sea level rises, less of the coastal areas -- where AFAIK most people live -- will be inhabitable.